johnr: A mobile number is not on the SIM to start with mobile number is on network side so all that is required is a SIM swap to a Micro SIM on your mobile number which takes approx 30 seconds

Thanks jr - did not know that. Pardon my continuing ignorance on this - how is the SIM swap actually achieved? Can I do it myself once I have the new device, or do I go to a Voda shop, or does my employer (who owns the contract) have to do it (or be involved) ....?